4.4.4. Film Water Solubility(S)

The technique of Rambabu et al. [37] was used to determine the film S percentage. The samples were cut into thin strips (20 × 20 mm) and dried in a hot-air oven for 24 h at 105 ◦C to a consistent weight. Each dried film sample was submerged for 24 h in 70 mL of distilled water. The film samples were then taken out of the solution and allowed to dry again at 100 ◦C for 24 h. Final weights were noted, and solubility was determined as follows:

$$S\left(\%\right) = \frac{\left(\text{Initial dry weight} - \text{Final dry weight}\right)}{\text{Initial dry weight}} \times 100\tag{2}$$
